KONINKLIJKE AKADEMIE VAN WETENSCHAPPEN 
TE AMSTERDAM, 
PROCEEDINGS OF THE MEETING 
of Saturday October 26, 1901, 
OG 
(Translated from: Verslag van de gewone vergadering der Wis- en Natuurkundige 
Afdeeling van Zaterdag 26 October 1901, Dl. X). 
Contents: “On the origin of double lines in the spectrum of the chromosphere, due to anomalous 
dispersion of the light from the photosphere”. By Prof. W. H. Jurrus, p. 195, (with 
one plate). — “Considerations in reference to a configuration of Szcre” (1st Part). 
By Prof. P. H. Scuours, p. 203. — “Urea derivatives (carbamides) of Sugars”, II. 
By Dr. N. Scuoort (Communicated by Prof. C. A. LoBry DE Bruyn), p. 214. — 
“The elementary motion of space S,”. By Dr. S. L. van Oss (Communicated by Prof, 
JAN DE VRIES), p. 218. — “On J. C. KAPTEYN's criticism of Arry’s method to 
determine the Apex of the solar motion”. By Dr. J. Srein 8. J. (Communicated by 
Prof. H. G. VAN DE SANDE BAKHUYZEN), p. 221. — “Reply to the criticism of 
Dr. J. Srei S.J.” By Prof. J. C. KAPTEYN, p. 232. — „On the Hydrosimeter’. By 
Prof. J. W. Morr. p. 243. (With one plate). 
The following papers were read: 
Physics. — “On the origin of double lines in the spectrum of the 
chromosphere, due to anomalous dispersion of the light from 
the photosphere’. By Prof. W. H. Jurrus. 
A peculiarity, appearing in the photographs which Prof. A. A. 
NYLAND obtained with the prismatic camera during the total eclipse 
of 18 May 19011), caused me to investigate more closely, in the 
line of my former paper on solar phenomena, what characteristics 
1) With the consent of Messrs NyLAND and WILTERDINK (the members of our 
expedition who were most concerned with the spectrographic researches) only this 
special feature of the photographs will» be shortly referred to in this paper. The 
report, containing a full account of the various observations made by our party, 
will be published afterwards. 
13 
Proceedings Royal Acad. Amsterdam. Vol. UV. 
